Select Clear data then OK, and on the screen that is displayed, select CLEAR ALL DATA then OK.

Select Clear cache then OK.

NOTE:

Specific version of Google Play Store may need the following solution.
Unplug the Ethernet cable from the TV, and connect to Wi-Fi temporarily.
By switching to Wi-Fi, the latest version of Google Play Store app will be installed.

You cannot install restricted applications when the Parental controls have been set.
Check the settings by performing the following procedure.Home -> Apps -> Google Play Store -> Settings -> Parental controls Settings